Drop hammer



April 14, 1931. I J, 30 1,800,339

DROP HAMMER Filed Aug. 12, 1929 Patented Apr. 14, 1931 PATENT. *oFFI-cEg;

Jesse's ri' oX, or BOSTON, MASSACHUSETTS nnor HAMMER Application filed August 12, 1929. Serial No. 385,109.

l his invention relates to that portion of a drop hammer which includes a bottom die adapted to cooperate with a weighted top die which is alternately raised and released to on the base 12, in accordance with the usual drop upon work resting on the lower die, the top die being guided in a predetermined vertical path, and the bottom die being adjustable'to enable it to accurately register with v the top die. Y

' T eibottom die is supported by a fixed shoefforming a part of the hammer frame. It isessential that'the bottom die be-longitudi- 'nally adjustableon the shoe, toward and I from the operators station. 1 o

l5 Theinvention .is embodied in improved means, as hereinafter described and claimed, for longitudinally adjusting the bottom die and for positively securing thebottom. die

in'any position to which itis'longitudinally '20 adjustable, the invention being an improve- 111161113 on that disclosed-bye my Patent 5N0. 1,356,908, dated o tobere's, 19:20.v

Of the accompanying d rawings forming a part ofthis specification, j j j Figure 1 isa fragmentary front elevation showing a portion of a drophammer embodying theinvention.

Figure 2 is asectio'n on line 22 0f' Fig- F1gure3' s a fragmentary transverse section, showing portions ofthe shoe and the a 7, bottom die, 'and means for engaging-the.a-d

bottom die. 7

Figure 4 is 'a'fragmentary' section on line -1 4 of Figurefi;

Figure 5 is a perspective view of the adjusting bar.

Figure 5a is a perspective view of a cap.

vjusting bar hereinafter described with the showing the outer end portion of the adjusting bar without its screw.

Figure 7 is a perspective view of the screw. 7

. of the frame of a drop hammer, said portions including a base 12 and uprights 13 between undercut face .18, and is: supplementedas .end. I have not illustrated the wedge shape,

Figure 6 is a fragmentary perspective view,

"epning' 32 (Figure '2) through which the which the weighted gravitating upper die, not shown, is guided in a predetermined path.

14 designates the shoe which is mounted practice.

16 designates the bottomdie which is engaged with the shoe in such manner that the die is adjustable longitudinally, or toward and from the operators station, the shoe and die being provided with means for permitting a longitudinal adjustment of the die and preventing a lateral adjustment independent of the shoe. 1 j

The bottom die 16 has adovetail projection 65 17 onits bottom movable in a dovetail recess in the top offthe shoe to permit longitudinal adjustments of the die. One; longitudinal wall or edge of said recess is formed by an j 7o usual, by a key or gib 19, formed in cross section, as shown by Figures 1 and 3, and having the usual wedge shape or taper from end to because the sameis well known. .v 7 The opposite longitudinal wall or edge of the shoe recess is formed by a fixed undercut face 20. Said recess includes 'afiat bottom face between the undercut faces 18 and 20. p

The face 20 in accordance with my invention, is supplemented by an elongated member shown separately by Figure '5. Said member includes a base portion 21'slidable in a guiding groove 22 (Figure 3) in theshoe, and a I gib portion 23,11'aving an inclined face conforming to the undercut recess face 20, and an undercut face engaging o'ne'edge of the dovetail pro ection 17 of the lower die. Between the ends of said member is a 'tenon entering a socket 27 (Figure 4) in the bottom die, so that anjendwi'se movement of the member causes a'n endwise movement of the die.

Qn the outer end of the adjusting bar is a downwardly projecting ear 2,8, 'to which is fixed'a'n adjusting [screw 2 9,extending parallelwi'ththe ba'r.

I An angular bracket 30 is'fixed by bolts 31 to the outer end of the shoe, and has] an upstanding abutment ,porticnprovided withgan m0 iii which they may be adjusted, there being no liability of accidental loosening and endwise movement of the bar.

It will be seen that the member shown by Figure 5 has a dual function, in that it ad justs the die and aids in guiding it in a predetermined path, the gib portion 23 constituting an element of die-guiding means.

To provide a rigid separable connection between the screw 29 and the ear'28, I provide the screw with a head or enlargement including a threaded portion 35, engaged with a tapped orifice 36 in the ear, and a shouldered hexagonal wrencli engaging portion seated on the outer side of the ear, and bracing the screw. In case the screw is disabled, it can be readily removed and another substituted' for it.

It will be seen that the means for adjusting the elongated member is wholly below the path in which the lower die is movable, so that said die may project to any desired extent from the forward end of the shoe.

The tenon 26 is integral both with the base portion 21 and thegib portion 23, so that it is firmly supported by the adjusting bar.

In case the socket 27 in the die is wider than.

the tenon, the latter may be enlarged by'a thin sheet metal cap 40, shown by Figure 5a placed on the tenon. Means such as alock nut 33a may be provided for preventing accidental rotation of the outer nut 33. The inner nut 33 is held so firmly against the inner side of the abutment portion of the bracket 30, by the outer screw and the locking nut 33a that it is not liable to be accidentally rotated.

A bushing ll of compressible material such as lead or fiber, may be inserted in the orifice 32, the screw 29 passing through said bushing. The object of the bushing is to prevent the transmission of jars or vibrations from the bracket 30 to the screw 29, and thus prevent crystallization of the screw. I

When the shoe 14 is of minimum thickness,

the bracket 30 may be attached to the base 12,

as shown by Figure 8.

I claim: Y

1. A drop hammer comprising a fixed shoe, having in its upper side a longitudinally extending recess defined by spaced apart undercut edge faces 18 and 20, and an intermediate 7 bottom face in which a guiding groove 22 is formed, an elongated member including a base portion slidable in said groove and a gib portion having an inclined outer side face conformingto the undercut recess face 5 20 and an undercut inner side face overhanging the recess bottom, a gib 19 having an inclined outer side face conforming to the undercut recess face 18, and an undercut inner side face overhanging the recess bottom, said 'gibs and recess'bottom defining a dovetail guideway, a bottom die having a dovetail 7 tending recess defined'by spaced apart undercut edge faces 18 and 20, and an intermediate bottom face, in which a guiding groove 22 is formed, an elongated member including a base portion slidable in said groove and a gib portion having an inclined outer side face conforming to the undercut recess face 20, and an undercut inner side face overhanging the recess bottom, a gib 19 having an inclined outer side face conforming to the/undercut recess face 18 and an undercut innerside face overhanging the recess bottom, said gibs and recess bottom. defining a dovetail guideway, a bottom die having a dovetail projection on its under side interengaged with and movable in said guideway,"saidelongated member having a tenon engaging a socket in said dovetail projection to cause longitudinal movements of the member to longitudinally adjust the die, said member having a downwardly projecting ear at its outer end, an adjusting screw having an enlarged screw threaded head engaged witha tapped socket in said ear, a fixed bracket having an orifice through which said screw extends, and nuts engaged with the screw at apposite sides of the abutment'and adapted to lock the screw to the abutment in various adjusted positions. 3. A drop hammer asspecified by claim 2, said bracket having an orifice through which the adjusting screw extends, and a compressible bushing interposed between the screw and the wall ofthe orifice to prevent crystallization of the screw by jars or'vibrations.

In testimony whereof I have affixed my 

